Four cases of sabungual exostosis.

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A subungual exostosis is a benign bone tumor occurring on the distal phalanx beneath the nail. Of the four cases, three were female and one was male. The mean age of the patients at the time of diagnosis was 14.8 years (range, 11 to 24 years). Two of the tumors occurred on the great toe, two were found on the hand, that is the thumb and the little finger. None of them had any history of significant trauma. Radiographically, all lesions occurred on the dorsal surface of the distal phalanx and they occurred at a site away from the epiphyseal line and were not connected in any way to it. Histologically, the cartilage cap was composed of fibrocartilage. The causative factors in the development of subungual exostosis have been unknown. Pardo Castello (1947) states that subungual exostoses are not true tumors, and are probably caused by major trauma or repeated causative factors though without any direct evidence. But there was no history of major trauma in our cases.The four cases were successfully treated by local excision.
西日本整形・災害外科学会の論文